SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '959a607fbf95a09660d3836baf3e907e634f2033151264c3763433e1c969cecf' 
  AND token = 'FgTVxBVl8q+4bGuSF2dO5b6QM3yqZBLoIH5wRQEvh5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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