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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f10f56eb94863120ebd6a8c4431b6dfb71b49a8e69aadf3b6ce403c35eb626d8' 
  AND token = 'FEV+bYXBhRtZaOFVW45YuDFyI8Khe7DJRS8hMez3EeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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