SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e9172ca821cbdb1a5e2b28da05b52d791bac3752c52f7d3cbf5b559168e8965' 
  AND token = 'Xw74HjF1VVg8JrFzxg12pC800BOs9zBhYZleebHhP8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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