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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd108731b1112b7545fc4698c6ed9d3a580d4700a4ad71031de4010b23cd6cb6d' 
  AND token = 'STQtSIih0EcToIlUZ994ESPLBJo2UbHrPSlq5vnZ0AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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