SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faf984fc75c379e54e96115d7c14f38d7fb12734638bfa790599afa5256537db' 
  AND token = 'rPhD1FRdH5vQvnjcWJbEZxL8v/LXk3YzNy0eEC7wEUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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