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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '591120c5a73f010cdf0e9b9a986aa8123147c9a0dbfd5a7ab7d03c72c9a1f0a1' 
  AND token = 'XF/8GrF/etW4PaVW4v47BT/cdFDsDqJigYY03Q5LxVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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