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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ebe5e3713e237a2afe1f805ad43779420e0ce2b9792cc073467de09caf6a358' 
  AND token = 'tx4j7iMfFHxoWjZF5lgmltrfdgLziCxJh+TCPpWCt5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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