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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01308b66dde00b6c602336bc7cd3bf270463976b857486940925d5a4db5d558b' 
  AND token = 'Yi+HXmi6ES3teYF+SwMz4FOO7FzKj+Ffte78XGWxM1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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