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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e25beccb8898961b5f10a97247535fb1df21dba02fb8b6cf332099f65afcc30' 
  AND token = 'g3bNz9MPms5KNzc8EP6smX6UljSVf7tjCXiarCSwXTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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