SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e56be1b283e56418a6dc35d4cb268f43c48edd5ad5d27751a62367d4765c7b77' 
  AND token = '9qWnvWrvMwhKIYfRR+LDnF4y391xWZzO/IVgOej2cTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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