SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43c93e003182fe41c1949f1ddbde05f054bfa433e918254302a936ad8ad02dd6' 
  AND token = '+sWCsExHkJRY3GpJhLx3rKLq7cPj2g77/8XKk5quBF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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