SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be534e955785e2069048498bf34dfe1ffe40e5faf54c2082b33e06d3bc7f5bed' 
  AND token = 'AgqyhCJ1qNIMFypBrfGP+hGH///BDCs3DfsXTr5VTYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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