Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b2d6571c6395cdb22509e8ce81096aed9491a13b0084286a7b7cc1a2e51b7ff' 
  AND token = 'ICg8NlV0Jkw/o/+r7vv5681a+jWcwQMJt0E06Xd5pXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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