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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cbe48760ee0d6c72eb95142183c87c14c3180460df5c4c9cc6d644f4f4c9335' 
  AND token = 'zL3O1oNYmwNSZ4sqPlUfKSGD46uNaH672EYtiDo/u24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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