SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4619ff33532d67c510986d6b31024b7723192939ebab798b9f1599871adf5164' 
  AND token = 'cjWxSPds8VfeoThhAfNwV0vZOERQoLIQZzHMSivajSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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