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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dd9aa10858a2a9db7715a6cedb91b923f11598d1a0328ed7b5f6d382bf63cdc' 
  AND token = 'Ftn7Hwqr9OQbykB21uOR1oyHYfe9/bu/PQnnvk29Prg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}