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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf8c4e051c226c8ab497be24d8ea7b7a49e9734119a997e730d594021403bd10' 
  AND token = 'cDdTg89S+ZG6xd3uV2R5R+nl0Xp2wO0312+N8Ca6tMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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