SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ee0a0b1f5a31394ca1533f58f068586ccf156a4232cd1108b2704eed98b236a' 
  AND token = 'PzIGg9Ke/Wz6fmyT6G+8q1AF9fAtDFVo9UXhNNbxFQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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