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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddf1d3482daeb7c24bd130bb1bdd792d434209bad998c3d7b3c63e9e79d2db2f' 
  AND token = 'uWQ8L1DjVstha/IYVrJWFtgZxmUloe0kIjDHcZCof2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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