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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ff5ec0c55c9578c01ba3b9f9d9875cefe4c80047fedc3a62a2e844b29d5dff' 
  AND token = 'qQE7xbMX/ljwihzNNP9Mwe0trQAczSlvLcyMQqqhhkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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