SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc95e78c2e1970f4fa804ff02757d74835f27af74bc5182a2918d3c3a370838b' 
  AND token = 'hLj8JCLKqi/iCHmehkEzOTiVX7JEzwQNqMWoIWSRF0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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