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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99a0e7c1d96d8a7971e9bb9b55b5fc08b315b3dee8d1b30a55047884840dd60d' 
  AND token = 'OT22FKPj5L8WsgsQM5rGm7srHJGEthJHfLjhaehGvUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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