Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0686d8ecf6e86fa789885e96837e58f4689919c51940aeb9cdf9fbd52b9ab66' 
  AND token = '3xqu4ro9YaiBIKib0/KtBySFD4Ti15CB+T98LN9vUMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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