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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f880c9222b83f4747e87559017c00e7a5b29060886b98ac58803ad13cdb4337c' 
  AND token = 'VpSDcXXd3zMr+eOI1xQrZEJHlUMyLAVJfpHOXQi8Ymg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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