SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d8762e27f730e6804df78d1862318c7971962d5ec91a5cb99ff1ed0a93efa5c' 
  AND token = 'hxBQ21X6JPiProwHVKTV3gNZVIlabwFjftMkJvsgzHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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