SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383676a800f47d2327e6e099825c0c3c37e8f51bc08048d39b298a644aebfc2d' 
  AND token = 'w8gr3zP3/X77HfD+yuW+6uWWsGSTQ2/+EqXah5dqhIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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