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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '332a6a7542945b17ab53633a7d89cade724829059c0a1b5b7016c9538ee89381' 
  AND token = 'Ju0fQCVS2tFC4DMkVifc9I34CW6zk3LSVuhCKo10Feo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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