SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a938ed002401aceb65058299766f9f526f536cdcc48f0519eb24df0fe7de850' 
  AND token = 'jVOTMHtxqW+B+X7rX2cKrUPTQ2mI1p2HiRvlV6OCPbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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