SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca807d62937aff2c94709564c646d76c7faa4935b99b4135218b5b75bc0b7a3b' 
  AND token = 'qB3VbEZJu/XnMOwUEtS6moocm9cSngNTBkBR4TZ+Wqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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