SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24115a58a17a79139d85fee5ee5d7fbd449dad2276728595f2dec334907a7fc9' 
  AND token = 'dQ+gVdshjeX8slOjykHTMRl+LZFXFzuv4Gd8BlSuBWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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