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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbba5740907d0c5e81682d5dede6bf0776e02bec07288c2d11c1bdc5a2c92040' 
  AND token = 'kb6fAmrjvA2aomA/QZJSWgSvRUDU71me9tDRoHbcrjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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