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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4f29e5bdeece750a413812ba0e66e0204fb76a49d6e28630980b36aa5dd2de5' 
  AND token = 'ku8f1lQGRbiX//QO0eW4UKz5BXUhH/ydkSXks/PnT4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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