SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5c7feff31e706f3b12f8537860430e369fa38b69290949c4e681bd5cf736a82' 
  AND token = 'eWtrD/lgl6+Wazjqf+7LCVV5ccmVRy/nXtB2pYLE8D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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