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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b199608a8b942a864d151aa02123d4585586d50b9fee9781e640f64eafc83ab4' 
  AND token = 'Je2IeDnuSJTrvep5aNqKrQQtqVg/aDa5M4F1LKHHY+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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