SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfaced9cb10b2d372f87d792373893ef099d7aa49c4fb187894903d205dea797' 
  AND token = '1fAmn1/ilSgL+vXjsKJz/QU5+7GECxBW9GhRLdIijdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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