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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '790b9f04a4837ef5ca33724d0653cb780f2f362766a937c796f321ea8fcf27f0' 
  AND token = 'Ao22s1e1B7XUo597sHdurjyXb2TCP702CevX+vwJ3xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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