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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5f20c4e0d877bc1bb906d07d6e568a7ab9b24359cf6e84e2bc85132f0a6b81c' 
  AND token = 'DOdvwsUCZBBkTpvEtPPoEz6dVy6n+hBp/wZ96bEhI6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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