SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19b5e5b379c4231c6bea5e56a948e8586bf26d84361f0cf8ab81f0f99e247bd0' 
  AND token = 'UqEzzbrWVHDzbqTQYMvZO6rjBl3jJalZ1pAmofj9Rxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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