SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2363a584832dcc3c5edb830b09bdad652e3ee95ea0f75f756fba129d6b4e644d' 
  AND token = 'WVgfspJTJJjMI0TqN1aLz+nq+evJugj/NYGtp5sMoVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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