SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c4e3b8762f147a07b7758fe42edfc7e483c0d512bd0ad5b0df5fd2e35ef790f' 
  AND token = 'njv6uxHvpMhiCF+BV42l/lW8YRK4bac0hGAhDU784UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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