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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de549dbe0a59ce9931d537f6ae2981a27e851df6718cef11bc72462ae660ca29' 
  AND token = 'KiUk9axZQOUrT/QBU+Xpl4wi35HUcIJ6DZlYzZXyftk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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