SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd52a2b5d954df6072d0647cd97ea73864e67ffc905f7474f031556250a0f3d73' 
  AND token = '00Ec8UQchnIhy59GVwcgzFBkvTxOxf1EJ4ZqURxjhoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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