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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a02f267c99a3eeb70d3d1fdf9ddbcf1c65bae99a2055f0b01116ae3ae9c2832' 
  AND token = 'YTJeDd5puhtxdLgHsjAvJkcecVIiySpQ8ol9b1WMXss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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