SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ad7dc931b7b362e02eedfdbf3e2270ee46db8918570cb7c06baac4c456e3b06' 
  AND token = '5vZBxJB0Eb8Q2i8q8Vd+xKhruaxjRF6YDLESpmmu0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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