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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da41b6fb755ccb11606d0f0a2bab8b3cb1abc5c0d3bc7f43fd5f683b3b840907' 
  AND token = 'ZJMPpOm77V9KDPmQUN4IVKzaodNCCuscXNW7b1fozKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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