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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dddd10f40b408b820b2fe944ccb3d897d4817a38702a808bd0d0f8e3667ba5a8' 
  AND token = 'AgH4ov3C0HXRMPMumUYEjAF2Njrt0zYrS7IkB2AE6QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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