SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74e681b6239dc2196ee6477ff5fc3f0f890ad7d3fd41fba177816d71a67a4778' 
  AND token = 'lwGTKGfVL+XzErOjSR9FJ2Kt3YmusGdDsjpHUpdVWs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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