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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4459f5df612a36dd049a9ffc7d15632bf894841c9be3633daac11b7a6e3a7640' 
  AND token = 'WtkSrXAYpywDN1gLxJ6Od0XkHogDCtIA4A1beZZPY6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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