SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90ba223479627818658be48e5dee34b553a9433ec2f3f2147754886e0a360429' 
  AND token = 'bF9+rRwjYXAQFCabFq42xf8CBQNpDDzGz+7E3z50h1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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