SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea69daab120969388de20bdc8d5bc5cc20c3a6b444665f46882aa13c72beb1fb' 
  AND token = 'PO/6JU3POXrD7q+x4XLg+vm6iA4LZYowhogg66qaj7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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