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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13a8efaabe60f75110816e72a350acf306b92d13a37ade8ae1949e2bb4b42a1d' 
  AND token = '1/V4+QxrfbLZLRV6PQO1G9wpyPz6Pma1I7ZqS9xtjvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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