SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74567b8fdb48c2725a07acf37123b17143dff9145332ef10c304063114dd2366' 
  AND token = 'OIvLBkqbJ5N5NQBbJuziyfwQgPQ3/1gjrcDY2ywkfvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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