SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588e3aafa713c86ac7c4d4d13445134877dac8093f6e0153c56b98af847735e6' 
  AND token = 'cvwGn2wANUZgyHDFwqhv4cVvRVIbS5DXHqkQAEjNPKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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