SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd79768dcdc5cba3dd17952d0503d4488de96cbecb2713f56f75c331ffff25896' 
  AND token = '4vmmsAilppWuvqBfr1LiBl6bv5s0Q4cBYwnZusRXzoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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