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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34026b41ea3e2feb1f613ac9f3ad225a93dd33cd5e33686156f9f62597337923' 
  AND token = '0tncQ0EaJ/wM9uPeaja80zPDK0nM7+jZiiYkAWFYV+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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