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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c4168c8b68e2203a868004adb0ee8cf291e99a287be2ef9b7cdf7aa32fe98da' 
  AND token = 'lT9cl9tXbnmL4MABawtsFXFo5qxshfdw6BedzN2a4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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