SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ab4e640c7d5bdc474754de60133e59f299c534b39afd6c14c9e028c1b7267a1' 
  AND token = 'chlVl4VL2+f/EgViG8EOnCF68GkocWkSjIZ8JlyYz0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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