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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac8a9dc4cd454f08da2c48f38a51129d3bf5cf52757268770e154a82d37589a7' 
  AND token = 'bodUZhMB5SNhzt5pLC4/9yFmDuwUD56OJAep8SAaMxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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