SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8967072b9b47e7a94501cafbe63d7071d5cc784324b7a0bec4b54131fa83feb' 
  AND token = 'MXLwB0o0zFmC31reXGFh0A+/zgAPFBJj4ErngODYC4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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