SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edbd034d0efbe9a1db5475fe98d8cdadfe840b339a89acd67d0cb098f23cab33' 
  AND token = 'ufCICBWpVZm6xkdVfeXM2LgGZ+pZf1+cVQyq/AwFz24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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