SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c94fa04830645bbd4d975a29a5bde799fa647dfc8cb53c5830bc6b7fa7e7bc05' 
  AND token = 'plBNGY+K7Y2Nrs/WvsjGBWppHWrclZ9g9wVivWzFIIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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