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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a3d612749369018327f0758f8f6aa0ef205a56113d3288e2b6e73089b67ee39' 
  AND token = 'wTK7wwhn0bf5r7UTcOgKOivwxd+f9Ykbg/95by4zB9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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