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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08689616a172f37f681f16d8e3d282c72de4ee2ba01715340f0d67e82d45ca97' 
  AND token = '5e3OifGQTreMJf14LK5T9PGNbEFCgRYrBi2DeyAgqF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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