SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e41803eda11b249d4c8b9d00a45b2c66110597a2e6992d1ee689d799be476386' 
  AND token = 'hJTaGGgPmbvBY/b7IngRl+fKOTJd7Uxee87/Qf4vz0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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