SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38406e130e9c1235546190c4328c7c6a898f56e1e53c8cf62b6f910241554c7b' 
  AND token = 'Pxp7V6KLQoowLXNInxmqbgr5TzvMPMSEwRJB1SmfQwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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